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All Products Are Sold For Research Use Only. Not For Human Consumption.

FORBIDDEN LABSPEPTIDES

Receptor Pharmacology Peptides

Retatrutide, MOTS-C, KLOW and KLOW AM: compounds studied in receptor binding, multi-receptor agonism and peptide signaling in laboratory models.

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Retatrutide

Receptor Pharmacology

$93.49$109.99/ 1 Vial · Every Month

Receptor Pharmacology

Retatrutide

$93.49$109.99/ 1 Vial · Every Month

Details

Pack Size

All Receptor Pharmacology Peptides

CompoundPriceAdd To Cart
Retatrutide • 10 MG • 1 VialMulti-Receptor Agonist Research$93.49$109.99Saving 15%
1

Delivers every month

MOTS-C • 10 MG • 1 VialMitochondrial Peptide Research$55.24$64.99Saving 15%
1

Delivers every month

KLOW • 10 MG • 1 VialPeptide Blend Research$38.24$44.99Saving 15%
1

Delivers every month

KLOW AM • 10 MG • 1 VialPeptide Blend Research$42.49$49.99Saving 15%
1

Delivers every month

The Science

How Receptor Agonism Works

Receptor pharmacology measures how a molecule binds a receptor and what the receptor does next. Researchers pick a compound by the receptor and the step they want to study. For laboratory research use only, not for human or animal consumption.

  1. 01

    Binding

    An agonist binds the orthosteric site of its receptor. Binding assays report how tightly it binds as an affinity constant.

    Studied here: Retatrutide

  2. 02

    Activation

    GIP, GLP-1 and glucagon receptors are class B G protein-coupled receptors. Agonist binding shifts each into an active shape that couples to the Gs protein.

    Studied here: Retatrutide

  3. 03

    Second Messengers

    Active Gs stimulates adenylyl cyclase, and cAMP rises inside the cell. cAMP assays are the standard readout for these receptors.

  4. 04

    Kinase Readout

    Further downstream, kinases such as AMPK change activity. Mitochondrial-derived peptides are studied for how they act at this kinase layer.

    Studied here: MOTS-C

In 3D

Three Receptors, One Research Molecule

Retatrutide is a single synthetic peptide that acts as an agonist at three receptors: GIP, GLP-1 and glucagon. That makes it a tool for comparing how one ligand binds and signals across three related receptor classes. Made in the USA, 10 MG per vial, shipped the same day.

3Receptors Targeted
GIP · GLP-1And Glucagon
10 MGPer Vial

View Retatrutide

A glass pipette releasing a drop into a clear dish

Sourcing And Manufacturing

Made And Shipped In The USA

Every compound in the collection is made in the United States and ships from here too. Each vial leaves capped and sealed, labelled with the compound, the amount per vial, the storage range and the research-use notice, and every compound's page names the field it is studied in. Tracking is emailed the moment your order leaves, so you can follow it all the way to your bench.

  1. 1

    Made In The USA

    Every compound in the collection is made in the United States.

  2. 2

    Sealed And Labelled

    Each vial leaves capped and sealed, labelled with the compound, the amount per vial, the storage range and the research-use notice.

  3. 3

    Research Area On Every Compound

    Every compound page shows the area of research it is studied in.

  4. 4

    Same-Day Shipping

    Orders ship from the US the same day, so vials spend less time in transit.

The Difference

Forbidden Labs Vs Other Brands

What you get here, and what you usually get elsewhere.

Shop The Collection
Forbidden Labs
Other Brands
Where It Is Made
Made In The USA
Often made overseas
Shipping
Same-day, from the US
Often ships from abroad
Research Area On Every Compound
Printed on every page
Rarely shown
Third Party Lab Tested
Every batch
Rarely
Purity Insurance
99%
Lower
Better Pricing
Direct from our lab
Reseller markups

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The Research Guide

Receptor Pharmacology Peptides: A Research Guide

Receptor Pharmacology is the Forbidden Labs field for compounds studied in receptor binding, multi-receptor agonism and peptide signaling: Retatrutide (10 MG), MOTS-C (10 MG) and our proprietary KLOW and KLOW AM (10 MG each). Every vial is made in the USA, shipped the same day, and sold for laboratory research use only, not for human or animal consumption.

What Researchers Study In This Field

Receptor pharmacology asks how a ligand binds its receptor, how strongly it activates it and which signals follow. Work in this field uses cell lines that express a single receptor, binding assays and cAMP readouts, alongside animal models.

The compounds in this field are tools for that work, and every product page lists its research area.

Retatrutide

Retatrutide is a synthetic peptide that acts as an agonist at the GIP, GLP-1 and glucagon receptors, studied in multi-receptor pharmacology. Each vial holds 10 MG.

MOTS-C

MOTS-C is a 16-amino-acid peptide encoded in mitochondrial DNA, studied in mitochondrial-nuclear signaling and AMPK pathway activity in laboratory models. Each vial holds 10 MG, and the compound also appears in the Mitochondrial Biology field.

KLOW And KLOW AM

KLOW and KLOW AM are proprietary Forbidden Labs research formulations, 10 MG each. Their full ingredient profiles are published once every active and its amount is confirmed.

How The Compounds Differ

Retatrutide works at the receptor level, across three receptors at once. MOTS-C is studied inside the cell, at the kinase layer. KLOW and KLOW AM are our own formulations, described once their formulas are confirmed. Together they cover the receptor and the signaling inside the cell.

Handling And Storage

Store every vial refrigerated at 2 to 8°C (36 to 46°F), away from light, and leave it sealed until it is needed. The storage range is printed on every label, and our storage guide covers the rest.

For Research Use Only

Every compound in this field is for laboratory research use only, not for human or animal consumption.

Glossary

Receptor Pharmacology Terms, Explained

The words you will meet on every compound page in this field, in plain language.

Agonist
A molecule that binds a receptor and activates it.
GLP-1 Receptor
A class B G protein-coupled receptor that binds the peptide GLP-1 (glucagon-like peptide-1).
GIP Receptor
A class B G protein-coupled receptor that binds the peptide hormone GIP.
Glucagon Receptor
A class B G protein-coupled receptor that binds glucagon, a 29-amino-acid peptide.
G Protein-Coupled Receptor
A receptor that crosses the cell membrane seven times and signals through G proteins inside the cell.
cAMP
Cyclic adenosine monophosphate, a second messenger whose level is the standard readout for Gs-coupled receptors.
AMPK
AMP-activated protein kinase, an enzyme that senses the ratio of AMP to ATP in a cell and phosphorylates downstream targets.
Mitochondrial-Derived Peptide
A peptide encoded by mitochondrial DNA. MOTS-C is one of them.

Subscribe And Save

Never Run Short.

Every compound has a subscription plan. Open any product on this page, pick a delivery gap, and every delivery comes off the price you see. Pause or cancel any time from your account.

15%Off every delivery, every month
10%Off every delivery, every 2 months
USAMade and shipped, same day

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What Our Customers Say

The transparency around the proprietary formulation stood out to me. The page makes it clear that additional details will follow formula verification.
10 MGKLOW AMView
Zachary B.
The ordering process was simple and the product information was easy to review. The research-only notice was clearly presented throughout the site.
10 MGKLOW AMView
Luke H.
The product arrived securely packaged with clear labeling. I also liked that the site doesn't overstate what is currently known about the formulation.
10 MGKLOW AMView
Grant P.
The Receptor Pharmacology category made the product easy to locate. The information on the page was clear about what has and hasn't been verified.
10 MGKLOW AMView
Owen D.
The product page clearly identifies KLOW AM as a proprietary research formulation. I liked that the site waits for formula verification before publishing detailed mechanism claims.
10 MGKLOW AMView
Jake W.
The product page doesn't pretend to know more than has actually been verified. That approach made the research information feel much more transparent.
10 MGKLOWView
Cameron J.
I appreciated the straightforward explanation of why detailed claims aren't published yet. The ordering process was simple and the package was securely prepared.
10 MGKLOWView
Logan T.
The product presentation was clean and the research-only positioning was obvious. The vial arrived sealed with readable labeling.
10 MGKLOWView
Brent S.
The product was easy to locate in the Receptor Pharmacology section. The page clearly explains the current limits of the available formulation information.
10 MGKLOWView
Cole M.
The page is refreshingly transparent about the fact that KLOW is a proprietary formulation. I liked that the site avoids making mechanism claims before the formula is verified.
10 MGKLOWView
Dylan R.
The product page made it easy to find the relevant research information. The package arrived quickly with a clear, professional-looking label.
10 MGMOTS-CView
Nathan C.
The research profile was easy to read and gave useful context without overclaiming. The overall ordering experience was smooth.
10 MGMOTS-CView
Ryan F.
I liked the clean presentation of the research information on the site. Everything arrived securely packaged and matched the order details.
10 MGMOTS-CView
David M.
The ordering experience was quick and uncomplicated. The vial arrived sealed with the compound name and storage information clearly printed.
10 MGMOTS-CView
Kevin P.
The Receptor Pharmacology section made MOTS-C easy to find and compare with other compounds. The product page also had useful research references.
10 MGMOTS-CView
Sam L.
The product page had everything I needed to identify the compound and review its research profile. The packaging was clean and the label was easy to read.
10 MGRetatrutideView
Kyle N.
The site has a clean layout that makes finding the Receptor Pharmacology compounds easy. The ordering process was straightforward and the confirmation came quickly.
10 MGRetatrutideView
Jordan R.
The product details were easy to review before placing the order. Packaging was secure and the vial arrived with clear labeling.
10 MGRetatrutideView
Andrew V.

Receptor Pharmacology FAQs

Questions about the compounds in this field.

Retatrutide (10 MG), MOTS-C (10 MG), KLOW (10 MG) and KLOW AM (10 MG).

A synthetic peptide agonist of the GIP, GLP-1 and glucagon receptors, studied in receptor pharmacology.

A 16-residue peptide encoded in the mitochondrial genome, studied in mitochondrial signaling in laboratory models.

Both are proprietary Forbidden Labs research peptide blends. Until every component and its amount is confirmed, we publish no mechanism for either.

Refrigerate every vial at 2 to 8°C (36 to 46°F), as printed on the label, away from light and sealed until it is needed.

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